JP5157755B2 - Rotating electric machine stator - Google Patents

Description

  The present invention relates to a stator of a rotating electrical machine, and more particularly to a stator of a rotating electrical machine in which a split core is fitted and fixed to an outer cylinder by shrinkage or the like.

  In recent years, rotating electrical machines used as electric motors and generators have been required to have small size, high output, and high quality.

  For example, in a rotating electrical machine mounted on a vehicle, the space for mounting the rotating electrical machine is becoming smaller, while an improvement in output is required.

  As a conventional rotating electrical machine, a structure is known in which a stator core divided in the circumferential direction is arranged in an annular shape, and a cylindrical case is fitted and fixed to the outer periphery thereof (see, for example, Patent Document 1).

Patent Document 1 discloses a method called shrinking as a method of fitting a cylindrical case around the outer periphery of a split core arranged in an annular shape. In this shrinking process, a cylindrical case having an inner peripheral size smaller than the outer peripheral size of the annular core is prepared, and the cylindrical case is heated to expand the inner peripheral size, and then the circular case is placed inside the cylindrical case. Insert the annular core. The annular core after shrinking and the cylindrical case are fixed by the stress generated by the dimensional difference.
JP 2002-51485 A

  By the way, as a method for manufacturing a stator coil composed of continuous windings, for example, there is the following method.

  First, a plurality of molded bodies in which a plurality of parallel straight portions are connected by a plurality of turn portions from an electric conductor wire are formed. Then, these molded bodies are assembled to form an assembled body.

  In this built-in body, a plurality of molded body sets composed of one molded body and another one molded body are arranged in parallel in the longitudinal direction of the built-in body. In addition, each molded body set constituting this built-in body includes a plurality of straight shapes formed by superimposing a plurality of straight portions in one molded body and a plurality of straight portions in another one molded body, respectively. An overlapping portion is provided in the longitudinal direction of the built-in body.

  For this reason, in this assembled body, a plurality of straight overlapping portions are arranged in parallel in the longitudinal direction of the assembled body. Then, the built-in body is wound around the core member a predetermined number of times to form a wound body. This winding body has a plurality of straight laminated portions formed in a circumferential direction in which a plurality of straight laminated portions in one molded body set are laminated in the radial direction.

  The wound body thus obtained is used as a cylindrical saddle-shaped stator coil. In assembling the stator coil to the stator core, each straight laminated portion is disposed in the slot of the stator core, and each turn portion is disposed outside the slot.

  However, it is very difficult to assemble this cylindrical saddle-shaped stator coil into an integrated stator core that is already in the shape of a core. So, using a split core with a shape that divides the annular core into multiple parts on the circumference, after assembling each split core from the outside of the cylindrical cage-shaped stator coil, the whole is fitted into the outer cylinder and fixed. Produce a child. The fitting into the outer cylinder is performed by shrinking into which the outer cylinder is heated and thermally expanded to be fitted.

  In the process of shrinking and shrinking the outer cylinder on the core assembly, an outer cylinder having an inner circumference smaller than the outer circumference of the core assembly was prepared, and the outer circumference was heated to expand the inner circumference by thermal expansion. Insert the core assembly into the outer cylinder in this state. The core assembly and the outer cylinder after shrinking are fixed by the stress generated by the dimensional difference. The tightening allowance is between the tightening allowance, which is the difference between the outer peripheral dimension of the core assembly and the inner peripheral dimension of the outer cylinder, and the stress generated between the core assembly after shrinking and the outer cylinder. There is a linear relationship that the greater the value, the greater the stress.

  The tightening allowance may be set to a value that can provide the stress necessary for fixing the core assembly and the outer cylinder, but it is almost impossible to manufacture with the dimensions of each part being exactly the same as the tightening allowance. Yes, generally with dimensional tolerances. Increasing this dimensional tolerance eliminates the difficulty in manufacturing parts, but has the following problems.

  That is, if the tightening margin increases due to the large dimensional tolerance, the stress generated between the core assembly and the outer cylinder becomes unnecessarily large. There was a risk of loss due to this stress.

  In addition, this causes problems such as deformation of the annular core composed of the split cores, variations in the core inner diameter, and a decrease in the roundness of the core inner diameter.

  Furthermore, when the dimensional tolerance is large, there is a problem that the difference in stress generated between the core assembly and the outer cylinder is large between the lower limit and the upper limit of the dimensional tolerance, and the performance (loss) varies greatly.

  This invention is made | formed in view of the said situation, and makes it the technical subject which should be solved to suppress the rapid increase of the stress which arises between a core assembly and an outer cylinder, taking a large dimensional tolerance.

  Hereinafter, each means suitable for solving the above-described problems will be described with additional effects and the like as necessary.

A stator of a rotating electrical machine according to the present invention is a stator of a rotating electrical machine having a plurality of phase windings and an outer cylinder fitted and fixed to the outer periphery of a core assembly in which a split core is assembled, Between the outer periphery of the split core and the inner periphery of the outer cylinder, the abutting end of the split core adjacent to the peripheral core in the circumferential direction is opposed to the contact surface of the inner periphery of the outer cylinder in the radial direction. The gap is formed by the shape of the outer periphery of the core assembly, and is a slit that penetrates between the core assembly and the outer cylinder in the axial direction. It is formed by a multiple of the number of the divided cores in the circumferential direction, and the fitting and fixing is shrinkage .

According to the present invention, by providing a gap between the outer periphery of the split core and the inner periphery of the outer cylinder, an increase in tightening margin and an increase in stress generated between the outer cylinder and the core assembly are obtained. Relationships can be made gentle. Thereby, it is possible to suppress a rapid increase in stress generated between the core assembly and the outer cylinder, while taking a large dimensional tolerance between the outer circumference of the split core and the inner circumference of the outer cylinder.

In addition, the abutting end of the adjacent split cores is not a gap but a contact surface on the inner periphery of the outer cylinder so that the force due to tightening can be applied uniformly to the abutting end, and the stress The loss due to the above can be reduced, the dimensional variation of the core inner diameter can be suppressed, and the roundness can be prevented from decreasing.

Further, since a slit is provided as an air gap between the core assembly and the outer cylinder in the axial direction, for example, cooling air or cooling water can flow in the slit. The outer cylinder can be cooled, and high performance can be maintained.

Further, since the slit is formed by a multiple of the number of the divided cores in the circumferential direction, the contact surface of the inner periphery of the outer cylinder can be evenly applied to the abutting end portions of the adjacent divided cores.

Further, since the gap is formed by the shape of the outer periphery of the core assembly, that is, the shape of the split core, it is only necessary to make the laminated steel plate constituting the split core have a recess at the outer peripheral position. There is no increase in the manufacturing cost, and there is an effect that it can be manufactured at low cost.

  In the present invention, the gap between the outer periphery of the core assembly and the inner periphery of the outer cylinder may be formed by both the outer peripheral shape of the core assembly and the inner peripheral surface of the outer cylinder. Needless to say.

In addition, if it is shrink-fitted, the core can be smoothly inserted into the outer cylinder and fixed securely by shrinking the outer cylinder on the outer periphery of the core assembly. There is an effect that power can be obtained.

  Hereinafter, embodiments of a stator for a rotating electrical machine according to the present invention will be described in detail.

  The embodiment to be described is merely an example of the embodiment, and the stator of the rotating electrical machine according to the present invention is not limited to the following embodiment. The stator of the rotating electrical machine according to the present invention can be implemented in various forms with modifications and improvements that can be made by those skilled in the art without departing from the gist of the present invention.

(Embodiment 1)
First, the structure of the rotary electric machine 1 using the stator of the rotary electric machine of this embodiment is demonstrated.

  As shown in FIG. 1, the rotary electric machine 1 is rotated by a housing 10 in which a pair of substantially bottomed cylindrical housing members 100 and 101 are joined to each other through openings and bearings 110 and 111. A rotating shaft 20 that is freely supported, a rotor 2 fixed to the rotating shaft 20, and a stator 3 fixed to the housing 10 at a position surrounding the rotor 2 inside the housing 10. .

  The rotor 2 is formed with a plurality of magnetic poles that are alternately different in the circumferential direction by permanent magnets on the outer peripheral side facing the inner peripheral side of the stator 3. The number of magnetic poles of the rotor 2 is not limited because it varies depending on the rotating electric machine. In this embodiment, an 8-pole rotor (N pole: 4, S pole: 4) is used.

  As shown in FIG. 2, the stator 3 includes a stator core 30, a three-phase stator coil 4 formed from a plurality of phase windings, and an outer cylinder 5 extrapolated to the stator core 30. It has the structure provided with. As will be described in detail later, in the stator 3 of the present embodiment, a gap is formed between the stator core 30 and the outer cylinder 5 by a slit 5 b provided on the inner peripheral surface of the outer cylinder 5. .

  As shown in FIG. 3, the stator core 30 has an annular shape in which a plurality of slots 31 are formed on the inner periphery. The plurality of slots 31 are formed such that the depth direction thereof coincides with the radial direction. The number of slots 31 formed in the stator core 30 is formed at a ratio of two per one phase of the stator coil 4 with respect to the number of magnetic poles of the rotor 2. In this embodiment, since 8 × 3 × 2 = 48, the number of slots is 48.

  The stator core 30 is formed by connecting a predetermined number (24 in the present embodiment) of the split cores 32 shown in FIG. 4 in the circumferential direction. The split core 32 has a shape in which one slot 31 is defined and one slot 31 is defined between the adjacent split cores 32 in the circumferential direction. Specifically, the split core 32 has a pair of teeth portions 320 that extend radially inward and a back core portion 321 that connects the teeth portions 320 radially outward.

  The split core 32 that constitutes the stator core 30 is formed by laminating electromagnetic steel plates. An insulating thin film is disposed between the laminated electrical steel sheets. The split core 32 constituting the stator core 30 may be formed not only from the laminated body of electromagnetic steel sheets but also using a conventionally known metal thin plate and insulating thin film.

  The shape of the stator core applicable to the present invention is not limited to that shown in FIGS. 3 and 4, and may be the shape shown in FIGS. 5 and 6, for example.

  The stator core 1030 in the example shown in FIGS. 5 and 6 has an annular shape in which a plurality of slots 1031 are formed on the inner periphery, and is formed by connecting the divided cores 1032 in the circumferential direction. The divided core 1032 divides one slot 1031 and divides one slot 1031 between the divided cores 1032 adjacent in the circumferential direction. The slot 1031 is defined by a tooth portion 1320 extending radially inward and a tooth portion 1320 adjacent to the tooth portion 1320. In addition, the back core portion 1321 in this example has a shape that does not overlap with the other divided cores 1032 in the radial direction. The number, material, and the like of the split core 1032 are the same as those of the split coil 32 shown in FIG.

  The stator coil 4 is formed by winding a plurality of windings 40 by a predetermined winding method. As shown in FIG. 7A, the winding 40 constituting the stator coil 4 includes a copper conductor 41 and an insulating coating 42 comprising an inner layer 420 and an outer layer 421 covering the outer periphery of the conductor 41 and insulating the conductor 41. And is formed from.

  As described above, since the insulating film 42 composed of the inner layer 420 and the outer layer 421 is thick, it is not necessary to sandwich insulating paper or the like between the windings 40 in order to insulate the windings 40 from each other. Insulating paper may be provided between the 40 or between the stator core 30 and the stator coil 4.

  Further, the winding 40 of the stator coil 4 is formed by coating the outer periphery of the insulating film 42 made of the inner layer 420 and the outer layer 421 with a fusion material 49 made of epoxy resin or the like, as shown in FIG. 7B. May be. In this case, since the fusion material 49 is melted faster than the insulating film 42 by the heat generated in the rotating electrical machine 1, the plurality of windings 40 installed in the same slot 31 are thermally bonded by the fusion material 49. . As a result, the plurality of windings 40 installed in the same slot 31 are integrated to form a steel body between the windings 40, so that the mechanical strength of the winding 40 in the slot 31 is improved.

  As shown in FIG. 8, each of the stator coils 4 is formed by two three-phase windings (U1, U2, V1, V2, W1, W2).

  As shown in FIG. 9, the stator coil 4 is a winding body 48 formed by winding a built-in body 47 (see FIG. 10) in which a plurality of windings 40 are incorporated in a predetermined shape. The winding 40 constituting the stator coil 4 is formed in a shape that is wave-wound along the circumferential direction on the inner peripheral side of the stator core 30.

  The winding 40 constituting the stator coil 4 includes a linear slot accommodating portion 43 accommodated in the slot 31 of the stator core 30 and a turn portion 44 that connects the adjacent slot accommodating portions 43 to each other. ing. The slot accommodating portions 43 are accommodated in the slots 31 for each predetermined number of slots (in this embodiment, 3 phases × 2 = 6). The turn portion 44 is formed so as to protrude from the end surface of the stator core 30 in the axial direction.

  The stator coil 4 is formed in a state in which both ends of the plurality of windings 40 protrude from the axial end face of the stator core 30 and the plurality of windings 40 are wound in a wave shape along the circumferential direction. . One phase of the stator coil 4 is formed by welding the ends of the first winding portion 40a and the second winding portion 40b together by welding. That is, one phase of the stator coil 4 is formed from one assembly formed by joining the ends of two molded bodies formed from two electric conductor wires.

  The slot accommodating portion 43 of the first winding portion 40a and the slot accommodating portion 43 of the second winding portion 40b are accommodated in the same slot 31. At this time, the slot accommodating portions 43 of the first winding portion 40 a and the slot accommodating portions 43 of the second winding portion 40 b are installed so as to be alternately positioned in the depth direction of the slot 31. And the joint part 45 of the 1st coil | winding part 40a and the 2nd coil | winding part 40b is the slot accommodation in which the winding direction of the 1st coil | winding part 40a and the 2nd coil | winding part 40b reverses. A folded portion 46 formed by the portion 43 is formed.

  FIG. 10 shows a development view of the stator coil 4, that is, a plan view of the built-in body 47 before being wound. The stator coil 4 has six sets of first winding portions 40a and second winding portions 40b having different winding directions, and three-phase ( U, V, W) × 2 (double slots) coils. In each assembly, the end on the side opposite to the end on the neutral point side (or phase terminal side) of the first winding portion 40a and the phase terminal side (or neutrality) of the second winding portion 40b. The end on the opposite side to the end on the dot side is connected via a slot accommodating portion 43 formed of a folded portion 46. The method of connecting the windings 40 of each phase is the same.

  FIG. 11 is a perspective view of an assembly 50 in which the stator core 30 is assembled to the stator coil 4 (winding body 48). Further, FIG. 12 shows a perspective view of the outer cylinder 5 that shrinks on the outer periphery of the assembly 50. Furthermore, the schematic top view which shows the outline | summary of the stator 3 formed by shrinking | fitting the outer cylinder 5 on the outer periphery of the assembly | attachment body 50 is shown in FIG.

  A back core portion 321 of the split core 32 stacked in the axial direction appears on the outer periphery of the assembly 50. The outer cylinder 5 has a cylindrical shape with a thickness of 2 mm, for example, and is formed of low carbon steel through which magnetic flux can pass. In addition, the outer cylinder 5 is provided with a through hole 5 a used when the stator 3 is fixed to the housing 10.

  In the first embodiment, when the outer diameter of the assembly 50 is A, the inner diameter of the outer cylinder 5 is B, and the inner diameter of the outer cylinder 5 that is thermally expanded during heating in the shrinking process is C, C> A> Each part is manufactured with dimensions determined so as to satisfy the relationship B.

  Here, (AB) is referred to as a tightening allowance. The larger the tightening allowance (A-B), the stronger the tightening force when the assembly 50 is squeezed into the outer cylinder 5 and cooled, but the tightening force greatly exceeds the tightening force required for fixing. If this occurs, there is a risk of loss due to this stress, and problems such as deformation of the split core, variation in core inner diameter, and decrease in roundness of the core inner diameter may occur.

  Therefore, in the first embodiment, the slit 5b is formed on the inner peripheral surface of the outer cylinder 5 to provide a gap between the assembly 50 and the outer cylinder 5, thereby increasing the tightening force gently as the tightening margin increases. It is trying to become. In the first embodiment, 24 slits 5b penetrate in the axial direction of the rotating electrical machine, and are provided at equal intervals, as with the number of the divided cores 32 in the circumferential direction. When shrinking the outer cylinder 5 around the outer periphery of the assembly 50, the slits 5b are prevented from coming to the abutting ends of adjacent divided cores (see FIG. 13).

  Here, the effect of the slit 5b will be further described with reference to FIG. FIG. 14 is a graph showing the relationship between the tightening allowance and the stress caused by the tightening force between the assembly 50 and the outer cylinder 5 as an experimental result. In the figure, the alternate long and short dash line indicates the inner diameter of the outer cylinder 5. The relationship when the slit 5b is not formed on the peripheral surface is shown, and the solid line shows the relationship when the slit 5b of the first embodiment is formed. In the figure, the horizontal axis is the tightening allowance, and the vertical axis indicates the stress due to the tightening force applied between the assembly 50 and the outer cylinder 5.

  In FIG. 14, the tightening allowance, which is the “necessary fixing force” that is the minimum force required to fix the assembly 50 and the outer cylinder 5, is shown as a lower limit value, and constant from the lower limit value. The tightening allowance with a width within the dimensional tolerance range is shown as the upper limit value. The dimensional tolerance range has the same width for both the one-dot chain line that does not form the slit 5b and the solid line that forms the slit 5b.

  As can be seen with reference to FIG. 14, when the slit 5b is not formed, the stress increases with an increase in the tightening margin, and when the slit 5b is formed, the stress increases with the increase in the tightening margin. is there. Thereby, while ensuring the same dimensional tolerance range, the stress at the upper limit value is smaller when the slit 5b of the first embodiment is formed, and the stress reduction effect is obtained. In other words, according to the first embodiment, this stress reduction effect can solve the problems such as the possibility of loss, the deformation of the split core, the variation of the core inner diameter, and the decrease in the roundness of the core inner diameter. it can.

  In the first embodiment, a slit 5b is formed in the inner peripheral surface of the outer cylinder 5 as a gap between the assembly 50 and the outer cylinder 5, and as shown in FIG. The assembly 50 and the outer cylinder 5 are positioned in the circumferential direction so that the slit 5b does not come to the part. Thereby, the contact surface 5c of the inner periphery of the outer cylinder 5 is opposed to the abutting end portion, and it is possible to apply a tightening force uniformly so that the divided cores are not displaced by the contact surface 5c, thereby reducing loss due to stress. In addition, it is possible to suppress the dimensional variation of the core inner diameter and prevent the roundness from being lowered.

  Moreover, in this Embodiment 1, as shown in FIG. 12, as a space | gap between the assembly body 50 and the outer cylinder 5, it is a slit which is a slit which penetrates between the core assembly body 50 and the outer cylinder 5 in the axial direction. 5 b is formed on the inner peripheral surface of the outer cylinder 5. According to this, for example, cooling air or cooling water can be flowed into the slit 5b, and in this way, the core and the outer cylinder can be cooled, and high performance can be maintained.

  In the first embodiment, the number of slits 5b is 24, the same as the number in the circumferential direction of the split core 32. However, the present invention is not limited to this, and for example, a multiple of the number in the circumferential direction of the split core. May be. If it does in this way, there exists an effect that the inner peripheral surface of an outer cylinder can be equally applied to the butting end part of adjacent division cores.

  In the first embodiment, the gap between the assembly 50 and the outer cylinder 5 is formed by the shape of the inner peripheral surface of the outer cylinder 5, that is, the slit 5b. In this case, since it is not necessary to change the shape of the split core 32 forming the magnetic circuit, it is possible to provide a rotating electrical machine with good performance without affecting the magnetic circuit.

  Hereinafter, in the first embodiment, the stator core 30 is assembled to the stator coil 4 (winding body 48) to form an assembled body 50 (see FIG. 11), and the assembled body 50 is baked into the outer cylinder 5 and fixed to the stator 3. The manufacturing method will be described. The assembled body 50 constitutes the core assembled body of the present invention. The radial direction means the radial direction of the core member or the wound body, and the circumferential direction means the circumferential direction of the core member or the wound body.

<Molding process>
First, 12 molded bodies are formed from 12 electric conductor wires. Each molded body to be molded here has a plurality of straight portions 431 extending in parallel with each other and arranged in parallel in the longitudinal direction of the molded body, and adjacent straight portions 431 are connected to one end side and the other end side of the straight portion 431. And a plurality of turn portions 44 that are alternately connected to each other.

<Incorporation process>
The built-in body 47 is formed by incorporating 12 molded bodies. In this built-in body 47, six sets of bodies are arranged in parallel in the longitudinal direction of the built-in body 47.

  Each assembly includes a first line portion that becomes the first winding portion 40a and a second line portion that becomes the second winding portion 40b. In addition, the 1st line part consists of one molded object, and the 2nd line part also consists of one molded object.

  The end portion of the first line portion and the end portion of the second line portion in each assembly are welded to form a joint portion 45. In addition, after assembling the twelve molded bodies, the end portion of the first line portion and the end portion of the second line portion in each assembly may be joined, or the end portion of the first line portion and the second portion. After joining the ends of the line portions to form six sets of assemblies, these six sets of assemblies may be incorporated.

  Each assembly in the built-in body 47 includes a plurality of straight overlapping portions 471 formed by overlapping a plurality of straight portions 431 in the first line portion and a plurality of straight portions 431 in the second line portion. It is in the longitudinal direction of the built-in body 47. However, each of the six straight portions 431 of the folded-back portion 46 and the six straight portions 431 at the end of winding, which are the start of winding in the winding process described later, is not overlapped with the other straight portions 431.

<Winding process>
The winding body 48 shown in FIG. 9 is formed by winding the built-in body 47 by a predetermined number of turns (for example, 3 or 4 times) so that the folded portion 46 is located on the axial center side. At this time, the turn portion 44 of the built-in body 47 is wound while being plastically deformed to a predetermined winding radius.

  For example, the turn part 44 may be bent and formed using a forming die having a forming surface having a predetermined bending R shape or a predetermined forming roller. Details of the winding process will be described later.

  The wound body 48 has a plurality of straight laminated portions 481 formed by laminating a plurality of straight overlapping portions 471 in one assembly by the number of turns in the radial direction in the circumferential direction of the wound body 48. In each of the straight stacked portions 481, the number of the straight portions 431 that is twice as many as the number of turns is overlapped and aligned in a row in the radial direction (radial direction). At this time, each of the straight laminated portions 481 is located in a state of being spaced apart in the circumferential direction of the winding body 48.

<Assembly process>
With respect to the wound body 48 obtained as described above, the teeth part 320 of the split core 32 is inserted into the gap between the adjacent straight laminated parts 481 from the radially outer side, and the adjacent split cores 32 are adjacent to each other. They are connected and assembled to obtain an assembled body 50 (see FIG. 11).

<Insertion (baking) process>
The assembly 50 (see FIG. 11) is inserted and fitted into the outer cylinder 5 (see FIG. 12). First, the outer cylinder 5 is heated to a predetermined temperature (for example, 300 ° C.) by a heater (not shown). Subsequently, the assembly 50 is inserted into the heated outer cylinder 5. At this time, the slit 5b provided on the inner peripheral surface of the outer cylinder 5 is inserted while positioning in the circumferential direction so as not to come to the butted end portions of the split cores 32 constituting the assembly 50. When the insertion is completed, it is cooled by a blower (not shown) for about 30 minutes, and the insertion (shrinking) process is completed.

(Embodiment 2)
In Embodiment 1 described above, the gap is formed between the assembly 50 and the outer cylinder 5 by the slit 5b provided on the inner peripheral surface of the outer cylinder 5, but the present invention is not limited to this. In this Embodiment 2, a space | gap is formed between an assembly body and the outer cylinder 5 with the shape of the outer periphery of an assembly body.

  FIG. 15 is a plan view showing the shape of the split laminated core of the second embodiment.

  The stator core of the second embodiment is formed by connecting a predetermined number (24 in the present embodiment) of the split cores 2032 shown in FIG. 15 in the circumferential direction. The split core 2032 has a shape that partitions one slot 2031 and partitions one slot 2031 between the adjacent split cores 2032 in the circumferential direction. Specifically, the split core 2032 includes a pair of teeth portions 2320 that extend radially inward and a back core portion 2321 that connects the teeth portions 2320 radially outward.

  A concave portion 2332 is provided on the outer periphery of the stator core formed by connecting the divided cores 2032 in the circumferential direction, that is, on the upper portion of the back core portion 2321 in FIG. 15, and the assembled body and the outer cylinder 5 are formed by the concave portion 2332. A gap can be formed between the two. Even in the second embodiment, the same stress reduction effect as in the first embodiment can be obtained.

  If the gap is formed by the shape of the outer periphery of the core assembly, that is, the shape of the split core as in Embodiment 2, it is only necessary to make the laminated steel plate constituting the split core have a recess at the outer peripheral position. In production, there is no increase in the number of processes, and there is an effect that it can be manufactured at low cost.

  In the present invention, the gap between the outer periphery of the core assembly and the inner periphery of the outer cylinder may be formed by both the outer peripheral shape of the core assembly and the inner peripheral surface of the outer cylinder. Needless to say.

  Moreover, in the said embodiment, in the fitting with the outer periphery of a core assembly, and the inner periphery of an outer cylinder, shrinkage was used, but in order to obtain required fitting force, by press-fitting with an outer peripheral surface and an inner peripheral surface For example, the contact surfaces may be inclined with respect to the insertion direction and taper fitted.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a rotating electrical machine mounted on an electric / hybrid vehicle, and the inner periphery of the stator core of the rotating electrical machine can be made close to a perfect circle, which is effective for downsizing and improving the output of the rotating electrical machine. It is.

FIG. 3 is an axial cross-sectional view schematically showing the configuration of the rotating electrical machine according to the first embodiment. FIG. 3 is a plan view of the stator according to the first embodiment. 3 is a plan view of a stator core according to Embodiment 1. FIG. 3 is a plan view of a split laminated core according to Embodiment 1. FIG. It is a top view of the stator core of a modification. It is a top view of the division | segmentation laminated | stacked core of a modification. FIG. 3 is a cross-sectional view of windings that constitute the stator coil according to the first embodiment. It is a figure which shows the connection of the stator coil which concerns on Embodiment 1. FIG. FIG. 3 is a perspective view of a winding body that is a stator coil according to the first embodiment. It is an expanded view of the stator coil which concerns on Embodiment 1, and is a top view of a built-in body. FIG. 3 is a perspective view of an assembly body according to the first embodiment. 3 is a perspective view of an outer cylinder according to Embodiment 1. FIG. FIG. 3 is a schematic plan view illustrating an outline of a stator according to the first embodiment. It is a graph which shows the relationship between a fastening allowance and the stress by the fastening force concerning an assembly body and an outer cylinder by an experimental result. 6 is a plan view of a split laminated core according to Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 3 Stator 30 Stator core 31a, 31b Slot 32 Divided core 321 Back core part 4 Stator coil 43 Slot accommodating part 44 Turn part 47 Built-in body 48 Winding body 431 Straight part 471 Directly overlapping part 472 Gap 481 Straight laminated portion 5 Outer cylinder 5a Through hole 5b Slit 5c Contact surface 50 Assembly

Claims (1)

A stator of a rotating electric machine having a plurality of phase windings and an outer cylinder fitted and fixed to the outer periphery of a core assembly in which a split core is assembled,
Between the outer periphery of the split core and the inner periphery of the outer cylinder, a butt end portion of the split core adjacent to the peripheral core in the circumferential direction faces the contact surface of the inner periphery of the outer cylinder in the radial direction. So that a gap is provided,
The gap is formed by the shape of the outer periphery of the core assembly, and is a slit that penetrates between the core assembly and the outer cylinder in the axial direction.
The slit is formed by a multiple of the number in the circumferential direction of the split core,
The stator of a rotating electrical machine , wherein the fitting and fixing is shrinkage .

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